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Note 15 - Share-based Compensation - Stock Option Activity (Details) - $ / shares
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Number of Shares Outstanding (in shares) 3,940,899  
Weighted Average Grant Date Fair Value, Outstanding (in dollars per share) $ 3.31  
Number of Shares Granted (in shares) 1,204,000 267,000
Weighted Average Grant Date Fair Value, Granted (in dollars per share) $ 2.73  
Number of Shares Forfeited/cancelled (in shares) (310,362)  
Weighted Average Grant Date Fair Value, Forfeited/cancelled (in dollars per share) $ 4.50  
Number of Shares Exercised (in shares) (20,000) (15,000)
Weighted Average Exercise Price, Exercised (in dollars per share) $ 1.58  
Number of Shares Outstanding, Balance (in shares) 4,814,537  
Weighted Average Exercise Price, Shares Outstanding, Balance (in dollars per share) $ 3.10  
Number of Shares Exercisable (in shares) 1,871,879  
Weighted Average Exercise Price, Shares Exercisable (in dollars per share) $ 2.83